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Pacific Science


University of Hawai'i Press

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Protein electrophoresis was used to study the population genetics of the endemic Hawaiian freshwater amphidromous gastropod Neritina granosa Sowerby. The genetic information was used to infer the pattern and degree of planktonic larval dispersal. Samples were taken from 12 streams located throughout the Hawaiian Archipelago during July, August, and September 1991. Overall mean heterozygosity was 0.052. Heterozygote deficiency was comparable with that found in other mollusks and marine invertebrates. Gene flow was substantial and was generally sufficient to maintain similar allele frequencies among stream populations. An island model of migration was indicated. However, significant heterogeneity among populations was observed and was due primarily to three geographically disparate streams. Causes of deficiency and heterogeneity remain unknown. Demographic information suggests that, although high from a genetic point of view, the rate of migration calculated from gene flow might be insufficient to affect demographic processes in large populations of N. granosa.


© 1998 by University of Hawai'i Press.

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